Misfiring after 475 miles

[itsmekylep]

it's rarely the PCM. Bosch MG1 ECU's are pretty stout units.

I have very little faith the PCM is the issue. Dealer doesn't have any other RHO's to swap PCM's to verify. Mine wasn't misfiring slightly different issues. Part is back order and been at the dealer since 2/3. Part might be there tomorrow. We'll see.

 

[frogjbm]

There is ALSO one for the lambda sensor wiring pulling out of the sensor. If you look at the lambda sensor that connects near the inlet to the turbos - it's too short from the factory and it's pulling on the pins. They even have an acronym for the pins coming out of the connector. I would think that's what's happening on yours.

View attachment 7395View attachment 7396

Spot on man, makes total sense! These trucks are known for short cable runs.

 

[gram10]

There is ALSO one for the lambda sensor wiring pulling out of the sensor. If you look at the lambda sensor that connects near the inlet to the turbos - it's too short from the factory and it's pulling on the pins. They even have an acronym for the pins coming out of the connector. I would think that's what's happening on yours.

View attachment 7395View attachment 7396

While driving tonight I was thinking about the cats melting and too much fuel,(i haven't had any issies) in my fairly limited tuning experience, this seemed off to me. Once the engine starts the combustion process when dropping to idle it goes crazy rich. I can't remember the last time I watched this situation on my previous cars, does this seem normal to you?

 

[Jeffhallphotos]

While driving tonight I was thinking about the cats melting and too much fuel,(i haven't had any issies) in my fairly limited tuning experience, this seemed off to me. Once the engine starts the combustion process when dropping to idle it goes crazy rich. I can't remember the last time I watched this situation on my previous cars, does this seem normal to you?

So my truck is in for service and this is from the service manager. Looks like the catalytic converter is toast.

 

[gram10]

So my truck is in for service and this is from the service manager. Looks like the catalytic converter is toast.

Well, the question is what damaged the cat...

The tech is saying a damaged cat caused the engine to run lean and them melted the cat, what damaged it in the first place..

 

[Jeffhallphotos]

Well, the question is what damaged the cat...

The tech is saying a damaged cat caused the engine to run lean and them melted the cat, what damaged it in the first place..

They are saying that the sensor went bad and thats what melted the CAT

 

[gram10]

They are saying that the sensor went bad and thats what melted the CAT

I see, I think I misread his last text. That would account for one of the possible causes, different from what I witnessed though in terms of running rich.

Hope you get the new cat spot!

 

[daniellelaven022]

Only one of the cats? Did they look at the other one to make sure it’s not both

 

[IdealRace]

Can you please confirm with your technician that it was the front turbocharger's catalyst?

And... if you could... did he bore scope the catalyst through the lambda sensor bungs and see that the catalyst had melted into a ball?